Event Description
Following touchdown, a vibration in the landing gear developed. This vibration led to the collapse of the right main landing gear at a speed of 117 knots. The right wing subsequently contacted the runway surface, and the airplane skidded to a stop on the runway before entering the overrun area. During the ensuing emergency evacuation, two passengers sustained minor injuries.
Examination Findings
Examination of the applicable components did not identify a specific cause for the initial vibration that precipitated the gear collapse. However, the threads on the right main landing gear apex bolt were found to have failed. This failure resulted in a 90-degree rotation of the gear assembly, which then collapsed due to overload. Additionally, the ground spoilers did not deploy during the event. The flight crew reported that they had armed the auto spoiler system.
Previous Incidents
The aircraft manufacturer reported a total of three similar non-flight-test occurrences. In all three of those events, the ground spoilers also failed to extend.